Electrical power generator with stationary direct current field excitation

An electrical power generator comprising:

• a stator;
• a stationary armature winding coupled to the stator;
• a stationary direct current (DC) field winding coupled to the stator;
• a magnetic shaft extending through the stator and the stationary DC field winding and including a rotor pole structure including one or more north poles extending radially outward from the magnetic shaft and one or more south poles extending radially outward from the magnetic shaft, wherein the one or more north poles and the one or more south poles are spaced apart axially along the magnetic shaft and positioned on opposing sides of the stationary DC field winding, and wherein the one or more north poles are axially offset relative to the one or more south poles on the magnetic shaft;
• a DC power source electrically connected to the stationary DC field winding and configured to induce a DC voltage in the stationary DC field winding to generate a magnetic flux that is conducted through the magnetic shaft and between the one or more north poles and the one or more south poles of the magnetic shaft;
• and
• a controller configured to 1) measure an output voltage of the electrical power generator, 2) determine a feedback error based at least on a difference between the output voltage and a target voltage, and 3) adjust a DC excitation current applied to the stationary DC field winding based on the feedback error to adjust a strength of the magnetic flux and thereby adjust the output voltage to reconcile with the target voltage.

An electrical power generator comprising:

• a stator;
• a stationary armature winding coupled to the stator;
• a stationary direct current (DC) field winding coupled to the stator;
• a magnetic shaft extending through the stator and the stationary DC field winding and including a rotor pole structure including one or more north poles extending radially outward from the magnetic shaft and one or more south poles extending radially outward from the magnetic shaft, wherein the one or more north poles and the one or more south poles are spaced apart axially along the magnetic shaft and positioned on opposing sides of the stationary DC field winding, and wherein the one or more north poles are axially offset relative to the one or more south poles on the magnetic shaft;
• and
• a DC power source electrically connected to the stationary DC field winding and configured to induce a DC voltage in the stationary DC field winding to generate a magnetic flux that is conducted through the magnetic shaft and between the one or more north poles and the one or more south poles of the magnetic shaft;
• wherein the electrical power generator is configured to output alternating current (AC) electrical power, and wherein a speed of the magnetic shaft and a frequency of the AC electrical power output from the electrical power generator are linearly coupled.